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<p>  使用Mybatis的开发者，大多数都会遇到一个问题，就是要写<strong>大量的SQL在xml文件</strong>中，除了特殊的业务逻辑SQL之外，还有<strong>大量结构类似的增删改查SQL</strong>。而且，当数据库表结构改动时，对应的所有SQL以及实体类都需要更改。这工作量和效率的影响或许就是区别增删改查程序员和真正程序员的屏障。</p>
</blockquote>
<blockquote>
<p>  <font color="red">Mybatis-plus中通用mapper就把普通的增删改查操作封装成了BaseMapper和IService</font>。下面我将讲述BaseMapper具体有哪些属性以及相关操作。</p>
</blockquote>
<hr>
<h2 id="一、代码生成"><a href="#一、代码生成" class="headerlink" title="一、代码生成"></a>一、代码生成</h2><p>  使用Mybatis-plus 代码生成器 AutoGenerator 以及添加相关依赖，生成代码。这些步骤我上一篇博客已经写过了，可以在博客底下点击查看上一篇文章。</p>
<h2 id="二、BaseMapper-CRUD-接口"><a href="#二、BaseMapper-CRUD-接口" class="headerlink" title="二、BaseMapper CRUD 接口"></a>二、BaseMapper CRUD 接口</h2><p><strong>说明：</strong></p>
<ul>
<li>通用 CRUD 封装BaseMapper接口，为<font color="#3FBF7F">Mybatis-Plus</font>启动时自动解析实体表关系映射转换为  <font color="#3FBF7F">Mybatis</font>内部对象注入容器</li>
<li>泛型 <strong>T</strong> 为任意实体对象</li>
<li>参数 <font color="#3FBF7F">Serializable</font>为任意类型主键 <font color="#3FBF7F">Mybatis-Plus</font>不推荐使用复合主键约定每一张表都有自己的唯一 id 主键</li>
<li>对象 <font color="#3FBF7F">Wrapper</font>为条件构造器</li>
</ul>
<p><strong>BaseMapper-CRUD官方文档：<a target="_blank" rel="noopener" href="https://mybatis.plus/guide/crud-interface.html#mapper-crud-%E6%8E%A5%E5%8F%A3">https://mybatis.plus/guide/crud-interface.html#mapper-crud-%E6%8E%A5%E5%8F%A3</a></strong></p>
<h3 id="1、增（Insert）"><a href="#1、增（Insert）" class="headerlink" title="1、增（Insert）"></a>1、增（Insert）</h3><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token comment">// 官网API</span>
<span class="token comment">// 插入一条记录</span>
<span class="token comment">// int insert(T entity);</span>

<span class="token annotation punctuation">@Autowired</span>
<span class="token keyword">private</span> <span class="token class-name">UserMapper</span> userMapper<span class="token punctuation">;</span>

<span class="token comment">//添加 -- BaseMapper api不支持批量添加</span>
<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">insert</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
<span class="token comment">//当前数据库id设置为自增,id策略需设置id-type配置</span>
	<span class="token class-name">User</span> user <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">User</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
	user<span class="token punctuation">.</span><span class="token function">setName</span><span class="token punctuation">(</span><span class="token string">"wangsong"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
	user<span class="token punctuation">.</span><span class="token function">setAge</span><span class="token punctuation">(</span><span class="token number">23</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
	user<span class="token punctuation">.</span><span class="token function">setEmail</span><span class="token punctuation">(</span><span class="token string">"1720696548@qq.com"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
	userMapper<span class="token punctuation">.</span><span class="token function">insert</span><span class="token punctuation">(</span>user<span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>user<span class="token punctuation">.</span><span class="token function">getId</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<h3 id="2、删（Delete）"><a href="#2、删（Delete）" class="headerlink" title="2、删（Delete）"></a>2、删（Delete）</h3><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token comment">//    官网api</span>
<span class="token comment">//    // 根据 entity 条件，删除记录</span>
<span class="token comment">//    int delete(@Param(Constants.WRAPPER) Wrapper&lt;T&gt; wrapper);</span>
<span class="token comment">//    // 删除（根据ID 批量删除）</span>
<span class="token comment">//    int deleteBatchIds(@Param(Constants.COLLECTION) Collection&lt;? extends Serializable&gt; idList);</span>
<span class="token comment">//    // 根据 ID 删除</span>
<span class="token comment">//    int deleteById(Serializable id);</span>
<span class="token comment">//    // 根据 columnMap 条件，删除记录</span>
<span class="token comment">//    int deleteByMap(@Param(Constants.COLUMN_MAP) Map&lt;String, Object&gt; columnMap);</span>


<span class="token annotation punctuation">@Autowired</span>
<span class="token keyword">private</span> <span class="token class-name">UserMapper</span> userMapper<span class="token punctuation">;</span>

<span class="token comment">// id删除</span>
<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">deleteById</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
	userMapper<span class="token punctuation">.</span><span class="token function">deleteById</span><span class="token punctuation">(</span><span class="token number">8</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>

<span class="token comment">// ids 批量删除</span>
<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">deleteBatchIds</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
	<span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">Long</span><span class="token punctuation">&gt;</span></span> ids <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">ArrayList</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token punctuation">&gt;</span></span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
	ids<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span><span class="token number">7</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
	ids<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span><span class="token number">6</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
	userMapper<span class="token punctuation">.</span><span class="token function">deleteBatchIds</span><span class="token punctuation">(</span>ids<span class="token punctuation">)</span><span class="token punctuation">;</span> 
<span class="token punctuation">}</span>


<span class="token comment">// columnMap 条件删除</span>
<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">deleteByMap</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
	<span class="token comment">//kay是字段名 value是字段值</span>
	<span class="token class-name">Map</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">,</span><span class="token class-name">Object</span><span class="token punctuation">&gt;</span></span> map <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">HashMap</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token punctuation">&gt;</span></span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
	map<span class="token punctuation">.</span><span class="token function">put</span><span class="token punctuation">(</span><span class="token string">"id"</span><span class="token punctuation">,</span><span class="token string">"6"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
	userMapper<span class="token punctuation">.</span><span class="token function">deleteByMap</span><span class="token punctuation">(</span>map<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>


<span class="token comment">// wrapper 条件删除</span>
<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">delete</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
	<span class="token comment">// 拼接sql参考：DELETE FROM user WHERE (id = ? AND name = ?)</span>
	<span class="token class-name">QueryWrapper</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">User</span><span class="token punctuation">&gt;</span></span> wrapper <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">QueryWrapper</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token punctuation">&gt;</span></span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token comment">// kay是字段名 value是字段值</span>
	wrapper<span class="token punctuation">.</span><span class="token function">eq</span><span class="token punctuation">(</span><span class="token string">"id"</span><span class="token punctuation">,</span><span class="token number">6</span><span class="token punctuation">)</span>
	<span class="token punctuation">.</span><span class="token function">eq</span><span class="token punctuation">(</span><span class="token string">"name"</span><span class="token punctuation">,</span><span class="token string">"wangsong"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
	userMapper<span class="token punctuation">.</span><span class="token function">delete</span><span class="token punctuation">(</span>wrapper<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<h3 id="3、改（Update）"><a href="#3、改（Update）" class="headerlink" title="3、改（Update）"></a>3、改（Update）</h3><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token comment">//    官网api</span>
<span class="token comment">//    //根据 whereEntity 条件，更新记录</span>
<span class="token comment">//    int update(@Param(Constants.ENTITY) T entity, @Param(Constants.WRAPPER) Wrapper&lt;T&gt; updateWrapper);</span>
<span class="token comment">//    //根据 ID 修改</span>
<span class="token comment">//    int updateById(@Param(Constants.ENTITY) T entity);</span>


<span class="token annotation punctuation">@Autowired</span>
<span class="token keyword">private</span> <span class="token class-name">UserMapper</span> userMapper<span class="token punctuation">;</span>


<span class="token comment">// 根据id 更新修改</span>
<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">updateById</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
	<span class="token class-name">User</span> user <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">User</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token comment">//需要修改的数据 Id</span>
	user<span class="token punctuation">.</span><span class="token function">setId</span><span class="token punctuation">(</span><span class="token number">9</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token comment">//需要修改的数据</span>
	user<span class="token punctuation">.</span><span class="token function">setName</span><span class="token punctuation">(</span><span class="token string">"erping"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
	user<span class="token punctuation">.</span><span class="token function">setAge</span><span class="token punctuation">(</span><span class="token number">23</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
	user<span class="token punctuation">.</span><span class="token function">setEmail</span><span class="token punctuation">(</span><span class="token string">"1720696548@qq.com"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
	userMapper<span class="token punctuation">.</span><span class="token function">updateById</span><span class="token punctuation">(</span>user<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>


<span class="token comment">// 使用 updateWrapper 条件修改（2种方式任选其一）</span>
<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">update</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
	<span class="token comment">//方式一</span>
	<span class="token comment">// 更新修改字段</span>
	<span class="token class-name">User</span> user <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">User</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
	user<span class="token punctuation">.</span><span class="token function">setEmail</span><span class="token punctuation">(</span><span class="token string">"xie430423@163.com"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token comment">// 更新添加,未设置条件 sql： UPDATE user SET email=?  ，设置后：UPDATE user SET email=? WHERE (id = ?)</span>
	<span class="token class-name">UpdateWrapper</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">User</span><span class="token punctuation">&gt;</span></span> wrapper1 <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">UpdateWrapper</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">User</span><span class="token punctuation">&gt;</span></span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
	wrapper1<span class="token punctuation">.</span><span class="token function">eq</span><span class="token punctuation">(</span><span class="token string">"id"</span><span class="token punctuation">,</span><span class="token number">9</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
	userMapper<span class="token punctuation">.</span><span class="token function">update</span><span class="token punctuation">(</span>user<span class="token punctuation">,</span>wrapper1<span class="token punctuation">)</span><span class="token punctuation">;</span>

	<span class="token comment">//方式二</span>
<span class="token comment">//  	UpdateWrapper&lt;User&gt; wrapper2 = new UpdateWrapper&lt;User&gt;();</span>
<span class="token comment">//  	wrapper2.set("email","666666@qq.com")   // 更新的内容，可往后 .set连接</span>
<span class="token comment">//          	.eq("id",9);                    // 更新的条件，可往后 .eq 添加</span>
<span class="token comment">//  	userMapper.update(null,wrapper2);</span>
<span class="token punctuation">}</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<h3 id="4、查（Select）"><a href="#4、查（Select）" class="headerlink" title="4、查（Select）"></a>4、查（Select）</h3><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token comment">//    官网api</span>
<span class="token comment">//</span>
<span class="token comment">//    // 根据 ID 查询</span>
<span class="token comment">//    T selectById(Serializable id);</span>
<span class="token comment">//    // 根据 entity 条件，查询一条记录</span>
<span class="token comment">//    T selectOne(@Param(Constants.WRAPPER) Wrapper&lt;T&gt; queryWrapper);</span>
<span class="token comment">//</span>
<span class="token comment">//    // 查询（根据ID 批量查询）</span>
<span class="token comment">//    List&lt;T&gt; selectBatchIds(@Param(Constants.COLLECTION) Collection&lt;? extends Serializable&gt; idList);</span>
<span class="token comment">//    // 根据 entity 条件，查询全部记录</span>
<span class="token comment">//    List&lt;T&gt; selectList(@Param(Constants.WRAPPER) Wrapper&lt;T&gt; queryWrapper);</span>
<span class="token comment">//    // 查询（根据 columnMap 条件）</span>
<span class="token comment">//    List&lt;T&gt; selectByMap(@Param(Constants.COLUMN_MAP) Map&lt;String, Object&gt; columnMap);</span>
<span class="token comment">//    // 根据 Wrapper 条件，查询全部记录</span>
<span class="token comment">//    List&lt;Map&lt;String, Object&gt;&gt; selectMaps(@Param(Constants.WRAPPER) Wrapper&lt;T&gt; queryWrapper);</span>
<span class="token comment">//    // 根据 Wrapper 条件，查询全部记录。注意： 只返回第一个字段的值</span>
<span class="token comment">//    List&lt;Object&gt; selectObjs(@Param(Constants.WRAPPER) Wrapper&lt;T&gt; queryWrapper);</span>
<span class="token comment">//</span>
<span class="token comment">//    // 根据 entity 条件，查询全部记录（并翻页）</span>
<span class="token comment">//    IPage&lt;T&gt; selectPage(IPage&lt;T&gt; page, @Param(Constants.WRAPPER) Wrapper&lt;T&gt; queryWrapper);</span>
<span class="token comment">//    // 根据 Wrapper 条件，查询全部记录（并翻页）</span>
<span class="token comment">//    IPage&lt;Map&lt;String, Object&gt;&gt; selectMapsPage(IPage&lt;T&gt; page, @Param(Constants.WRAPPER) Wrapper&lt;T&gt; queryWrapper);</span>
<span class="token comment">//    // 根据 Wrapper 条件，查询总记录数</span>
<span class="token comment">//    Integer selectCount(@Param(Constants.WRAPPER) Wrapper&lt;T&gt; queryWrapper);</span>


<span class="token annotation punctuation">@Autowired</span>
<span class="token keyword">private</span> <span class="token class-name">UserMapper</span> userMapper<span class="token punctuation">;</span>


<span class="token comment">// id查询</span>
<span class="token annotation punctuation">@Test</span>
<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">selectById</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
	<span class="token class-name">User</span> user <span class="token operator">=</span> userMapper<span class="token punctuation">.</span><span class="token function">selectById</span><span class="token punctuation">(</span><span class="token number">1L</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>user<span class="token punctuation">.</span><span class="token function">toString</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>


<span class="token comment">// ids 批量查询</span>
<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">selectBatchIds</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
	<span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">Long</span><span class="token punctuation">&gt;</span></span> ids <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">ArrayList</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token punctuation">&gt;</span></span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
	ids<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
	ids<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span><span class="token number">2</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">User</span><span class="token punctuation">&gt;</span></span> users <span class="token operator">=</span> userMapper<span class="token punctuation">.</span><span class="token function">selectBatchIds</span><span class="token punctuation">(</span>ids<span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>users<span class="token punctuation">.</span><span class="token function">toString</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>


<span class="token comment">// 查询全部</span>
<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">selectList</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
	<span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">User</span><span class="token punctuation">&gt;</span></span> users <span class="token operator">=</span> userMapper<span class="token punctuation">.</span><span class="token function">selectList</span><span class="token punctuation">(</span><span class="token keyword">null</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>users<span class="token punctuation">.</span><span class="token function">toString</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>

<span class="token comment">//  条件查询 queryWrapper（无条件则查询全部）</span>
<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">selectListWrapper</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
	<span class="token class-name">QueryWrapper</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">User</span><span class="token punctuation">&gt;</span></span> wrapper <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">QueryWrapper</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token punctuation">&gt;</span></span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
	wrapper<span class="token punctuation">.</span><span class="token function">eq</span><span class="token punctuation">(</span><span class="token string">"id"</span><span class="token punctuation">,</span><span class="token number">1</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">User</span><span class="token punctuation">&gt;</span></span> users <span class="token operator">=</span> userMapper<span class="token punctuation">.</span><span class="token function">selectList</span><span class="token punctuation">(</span>wrapper<span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>users<span class="token punctuation">.</span><span class="token function">toString</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>

<span class="token comment">//  分页查询 selectPage</span>
<span class="token comment">//  需添加分页插件配置： 详见config/MybatisPlusConfig.java</span>
<span class="token keyword">public</span> <span class="token keyword">void</span> <span class="token function">selectPage</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
	<span class="token comment">// 页数 /每页记录数</span>
	<span class="token class-name">Page</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">User</span><span class="token punctuation">&gt;</span></span> page <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Page</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token punctuation">&gt;</span></span><span class="token punctuation">(</span><span class="token number">1</span><span class="token punctuation">,</span><span class="token number">2</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token comment">// 分页 / 参数二：wrapper查询条件</span>
	<span class="token class-name">Page</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">User</span><span class="token punctuation">&gt;</span></span> userPage <span class="token operator">=</span> userMapper<span class="token punctuation">.</span><span class="token function">selectPage</span><span class="token punctuation">(</span>page<span class="token punctuation">,</span> <span class="token keyword">null</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"总页数"</span><span class="token operator">+</span>userPage<span class="token punctuation">.</span><span class="token function">getPages</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">"总记录数"</span><span class="token operator">+</span>userPage<span class="token punctuation">.</span><span class="token function">getTotal</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>userPage<span class="token punctuation">.</span><span class="token function">getRecords</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">toString</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<h3 id="5、配置分页拦截器"><a href="#5、配置分页拦截器" class="headerlink" title="5、配置分页拦截器"></a>5、配置分页拦截器</h3><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token comment">//Spring boot方式</span>
<span class="token annotation punctuation">@EnableTransactionManagement</span>
<span class="token annotation punctuation">@Configuration</span>
<span class="token annotation punctuation">@MapperScan</span><span class="token punctuation">(</span><span class="token string">"com.xxgg.blog.mapper"</span><span class="token punctuation">)</span>
<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">MybatisPlusConfig</span> <span class="token punctuation">{</span>

    <span class="token comment">/**
     * 新的分页插件,一缓和二缓遵循mybatis的规则,需要设置 MybatisConfiguration#useDeprecatedExecutor = false 避免缓存出现问题(该属性会在旧插件移除后一同移除)
     */</span>
    <span class="token annotation punctuation">@Bean</span>
    <span class="token keyword">public</span> <span class="token class-name">MybatisPlusInterceptor</span> <span class="token function">mybatisPlusInterceptor</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token class-name">MybatisPlusInterceptor</span> interceptor <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">MybatisPlusInterceptor</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        interceptor<span class="token punctuation">.</span><span class="token function">addInnerInterceptor</span><span class="token punctuation">(</span><span class="token keyword">new</span> <span class="token class-name">PaginationInnerInterceptor</span><span class="token punctuation">(</span><span class="token class-name">DbType</span><span class="token punctuation">.</span>MYSQL<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">return</span> interceptor<span class="token punctuation">;</span>
    <span class="token punctuation">}</span>

    <span class="token annotation punctuation">@Bean</span>
    <span class="token keyword">public</span> <span class="token class-name">ConfigurationCustomizer</span> <span class="token function">configurationCustomizer</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">return</span> configuration <span class="token operator">-&gt;</span> configuration<span class="token punctuation">.</span><span class="token function">setUseDeprecatedExecutor</span><span class="token punctuation">(</span><span class="token boolean">false</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<h2 id="三、IBaseService-CRUD-接口"><a href="#三、IBaseService-CRUD-接口" class="headerlink" title="三、IBaseService CRUD 接口"></a>三、IBaseService CRUD 接口</h2><p><strong>说明：</strong></p>
<ul>
<li><strong>通用 Service CRUD 封装IService接口</strong>，进一步封装 CRUD 采用 <font color="#3FBF7F">get 查询单行 、remove 删除 、list 查询集合 、page 分页</font>，前缀命名方式区分 Mapper 层避免混淆，</li>
<li>泛型 <strong>T</strong> 为任意实体对象</li>
<li>建议如果存在自定义通用 Service 方法的可能，请创建自己的 <font color="#3FBF7F">IBaseService</font>继承 Mybatis-Plus 提供的基类</li>
<li>对象<font color="#3FBF7F">Wrapper</font> 为条件构造器</li>
</ul>
<p><strong>Service官网Api文档：<a target="_blank" rel="noopener" href="https://mybatis.plus/guide/crud-interface.html#service-crud">https://mybatis.plus/guide/crud-interface.html#service-crud</a></strong></p>
<p><font color="red">注：BaseMapper 不支持批量操作，IBaseService支持批量操作</font></p>
<h3 id="1、save（增）"><a href="#1、save（增）" class="headerlink" title="1、save（增）"></a>1、save（增）</h3><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token comment">// 插入一条记录（选择字段，策略插入）</span>
<span class="token keyword">boolean</span> <span class="token function">save</span><span class="token punctuation">(</span><span class="token class-name">T</span> entity<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// 插入（批量）</span>
<span class="token keyword">boolean</span> <span class="token function">saveBatch</span><span class="token punctuation">(</span><span class="token class-name">Collection</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">T</span><span class="token punctuation">&gt;</span></span> entityList<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// 插入（批量）</span>
<span class="token keyword">boolean</span> <span class="token function">saveBatch</span><span class="token punctuation">(</span><span class="token class-name">Collection</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">T</span><span class="token punctuation">&gt;</span></span> entityList<span class="token punctuation">,</span> <span class="token keyword">int</span> batchSize<span class="token punctuation">)</span><span class="token punctuation">;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<h3 id="2、SaveOrUpdate（增或改）"><a href="#2、SaveOrUpdate（增或改）" class="headerlink" title="2、SaveOrUpdate（增或改）"></a>2、SaveOrUpdate（增或改）</h3><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token comment">// TableId 注解存在更新记录，否插入一条记录</span>
<span class="token keyword">boolean</span> <span class="token function">saveOrUpdate</span><span class="token punctuation">(</span><span class="token class-name">T</span> entity<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// 根据updateWrapper尝试更新，否继续执行saveOrUpdate(T)方法</span>
<span class="token keyword">boolean</span> <span class="token function">saveOrUpdate</span><span class="token punctuation">(</span><span class="token class-name">T</span> entity<span class="token punctuation">,</span> <span class="token class-name">Wrapper</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">T</span><span class="token punctuation">&gt;</span></span> updateWrapper<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// 批量修改插入</span>
<span class="token keyword">boolean</span> <span class="token function">saveOrUpdateBatch</span><span class="token punctuation">(</span><span class="token class-name">Collection</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">T</span><span class="token punctuation">&gt;</span></span> entityList<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// 批量修改插入</span>
<span class="token keyword">boolean</span> <span class="token function">saveOrUpdateBatch</span><span class="token punctuation">(</span><span class="token class-name">Collection</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">T</span><span class="token punctuation">&gt;</span></span> entityList<span class="token punctuation">,</span> <span class="token keyword">int</span> batchSize<span class="token punctuation">)</span><span class="token punctuation">;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<h3 id="3、Remove（删）"><a href="#3、Remove（删）" class="headerlink" title="3、Remove（删）"></a>3、Remove（删）</h3><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token comment">// 根据 entity 条件，删除记录</span>
<span class="token keyword">boolean</span> <span class="token function">remove</span><span class="token punctuation">(</span><span class="token class-name">Wrapper</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">T</span><span class="token punctuation">&gt;</span></span> queryWrapper<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// 根据 ID 删除</span>
<span class="token keyword">boolean</span> <span class="token function">removeById</span><span class="token punctuation">(</span><span class="token class-name">Serializable</span> id<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// 根据 columnMap 条件，删除记录</span>
<span class="token keyword">boolean</span> <span class="token function">removeByMap</span><span class="token punctuation">(</span><span class="token class-name">Map</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">,</span> <span class="token class-name">Object</span><span class="token punctuation">&gt;</span></span> columnMap<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// 删除（根据ID 批量删除）</span>
<span class="token keyword">boolean</span> <span class="token function">removeByIds</span><span class="token punctuation">(</span><span class="token class-name">Collection</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token operator">?</span> <span class="token keyword">extends</span> <span class="token class-name">Serializable</span><span class="token punctuation">&gt;</span></span> idList<span class="token punctuation">)</span><span class="token punctuation">;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<h3 id="4、Update（改）"><a href="#4、Update（改）" class="headerlink" title="4、Update（改）"></a>4、Update（改）</h3><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token comment">// 根据 UpdateWrapper 条件，更新记录 需要设置sqlset</span>
<span class="token keyword">boolean</span> <span class="token function">update</span><span class="token punctuation">(</span><span class="token class-name">Wrapper</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">T</span><span class="token punctuation">&gt;</span></span> updateWrapper<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// 根据 whereEntity 条件，更新记录</span>
<span class="token keyword">boolean</span> <span class="token function">update</span><span class="token punctuation">(</span><span class="token class-name">T</span> entity<span class="token punctuation">,</span> <span class="token class-name">Wrapper</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">T</span><span class="token punctuation">&gt;</span></span> updateWrapper<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// 根据 ID 选择修改</span>
<span class="token keyword">boolean</span> <span class="token function">updateById</span><span class="token punctuation">(</span><span class="token class-name">T</span> entity<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// 根据ID 批量更新</span>
<span class="token keyword">boolean</span> <span class="token function">updateBatchById</span><span class="token punctuation">(</span><span class="token class-name">Collection</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">T</span><span class="token punctuation">&gt;</span></span> entityList<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// 根据ID 批量更新</span>
<span class="token keyword">boolean</span> <span class="token function">updateBatchById</span><span class="token punctuation">(</span><span class="token class-name">Collection</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">T</span><span class="token punctuation">&gt;</span></span> entityList<span class="token punctuation">,</span> <span class="token keyword">int</span> batchSize<span class="token punctuation">)</span><span class="token punctuation">;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<h3 id="5、Get（按条件查）"><a href="#5、Get（按条件查）" class="headerlink" title="5、Get（按条件查）"></a>5、Get（按条件查）</h3><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token comment">// 根据 ID 查询</span>
<span class="token class-name">T</span> <span class="token function">getById</span><span class="token punctuation">(</span><span class="token class-name">Serializable</span> id<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// 根据 Wrapper，查询一条记录。结果集，如果是多个会抛出异常，随机取一条加上限制条件 wrapper.last("LIMIT 1")</span>
<span class="token class-name">T</span> <span class="token function">getOne</span><span class="token punctuation">(</span><span class="token class-name">Wrapper</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">T</span><span class="token punctuation">&gt;</span></span> queryWrapper<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// 根据 Wrapper，查询一条记录</span>
<span class="token class-name">T</span> <span class="token function">getOne</span><span class="token punctuation">(</span><span class="token class-name">Wrapper</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">T</span><span class="token punctuation">&gt;</span></span> queryWrapper<span class="token punctuation">,</span> <span class="token keyword">boolean</span> throwEx<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// 根据 Wrapper，查询一条记录</span>
<span class="token class-name">Map</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">,</span> <span class="token class-name">Object</span><span class="token punctuation">&gt;</span></span> <span class="token function">getMap</span><span class="token punctuation">(</span><span class="token class-name">Wrapper</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">T</span><span class="token punctuation">&gt;</span></span> queryWrapper<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// 根据 Wrapper，查询一条记录</span>
<span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">V</span><span class="token punctuation">&gt;</span></span> <span class="token class-name">V</span> <span class="token function">getObj</span><span class="token punctuation">(</span><span class="token class-name">Wrapper</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">T</span><span class="token punctuation">&gt;</span></span> queryWrapper<span class="token punctuation">,</span> <span class="token class-name">Function</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token operator">?</span> <span class="token keyword">super</span> <span class="token class-name">Object</span><span class="token punctuation">,</span> <span class="token class-name">V</span><span class="token punctuation">&gt;</span></span> mapper<span class="token punctuation">)</span><span class="token punctuation">;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<h3 id="6、List（查）"><a href="#6、List（查）" class="headerlink" title="6、List（查）"></a>6、List（查）</h3><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token comment">// 查询所有</span>
<span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">T</span><span class="token punctuation">&gt;</span></span> <span class="token function">list</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// 查询列表</span>
<span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">T</span><span class="token punctuation">&gt;</span></span> <span class="token function">list</span><span class="token punctuation">(</span><span class="token class-name">Wrapper</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">T</span><span class="token punctuation">&gt;</span></span> queryWrapper<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// 查询（根据ID 批量查询）</span>
<span class="token class-name">Collection</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">T</span><span class="token punctuation">&gt;</span></span> <span class="token function">listByIds</span><span class="token punctuation">(</span><span class="token class-name">Collection</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token operator">?</span> <span class="token keyword">extends</span> <span class="token class-name">Serializable</span><span class="token punctuation">&gt;</span></span> idList<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// 查询（根据 columnMap 条件）</span>
<span class="token class-name">Collection</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">T</span><span class="token punctuation">&gt;</span></span> <span class="token function">listByMap</span><span class="token punctuation">(</span><span class="token class-name">Map</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">,</span> <span class="token class-name">Object</span><span class="token punctuation">&gt;</span></span> columnMap<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// 查询所有列表</span>
<span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">Map</span><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">,</span> <span class="token class-name">Object</span><span class="token punctuation">&gt;</span><span class="token punctuation">&gt;</span></span> <span class="token function">listMaps</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// 查询列表</span>
<span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">Map</span><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">,</span> <span class="token class-name">Object</span><span class="token punctuation">&gt;</span><span class="token punctuation">&gt;</span></span> <span class="token function">listMaps</span><span class="token punctuation">(</span><span class="token class-name">Wrapper</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">T</span><span class="token punctuation">&gt;</span></span> queryWrapper<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// 查询全部记录</span>
<span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">Object</span><span class="token punctuation">&gt;</span></span> <span class="token function">listObjs</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// 查询全部记录</span>
<span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">V</span><span class="token punctuation">&gt;</span></span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">V</span><span class="token punctuation">&gt;</span></span> <span class="token function">listObjs</span><span class="token punctuation">(</span><span class="token class-name">Function</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token operator">?</span> <span class="token keyword">super</span> <span class="token class-name">Object</span><span class="token punctuation">,</span> <span class="token class-name">V</span><span class="token punctuation">&gt;</span></span> mapper<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// 根据 Wrapper 条件，查询全部记录</span>
<span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">Object</span><span class="token punctuation">&gt;</span></span> <span class="token function">listObjs</span><span class="token punctuation">(</span><span class="token class-name">Wrapper</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">T</span><span class="token punctuation">&gt;</span></span> queryWrapper<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// 根据 Wrapper 条件，查询全部记录</span>
<span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">V</span><span class="token punctuation">&gt;</span></span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">V</span><span class="token punctuation">&gt;</span></span> <span class="token function">listObjs</span><span class="token punctuation">(</span><span class="token class-name">Wrapper</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">T</span><span class="token punctuation">&gt;</span></span> queryWrapper<span class="token punctuation">,</span> <span class="token class-name">Function</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token operator">?</span> <span class="token keyword">super</span> <span class="token class-name">Object</span><span class="token punctuation">,</span> <span class="token class-name">V</span><span class="token punctuation">&gt;</span></span> mapper<span class="token punctuation">)</span><span class="token punctuation">;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<h3 id="7、Page（分页查）"><a href="#7、Page（分页查）" class="headerlink" title="7、Page（分页查）"></a>7、Page（分页查）</h3><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token comment">// 无条件分页查询</span>
<span class="token class-name">IPage</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">T</span><span class="token punctuation">&gt;</span></span> <span class="token function">page</span><span class="token punctuation">(</span><span class="token class-name">IPage</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">T</span><span class="token punctuation">&gt;</span></span> page<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// 条件分页查询</span>
<span class="token class-name">IPage</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">T</span><span class="token punctuation">&gt;</span></span> <span class="token function">page</span><span class="token punctuation">(</span><span class="token class-name">IPage</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">T</span><span class="token punctuation">&gt;</span></span> page<span class="token punctuation">,</span> <span class="token class-name">Wrapper</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">T</span><span class="token punctuation">&gt;</span></span> queryWrapper<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// 无条件分页查询</span>
<span class="token class-name">IPage</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">Map</span><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">,</span> <span class="token class-name">Object</span><span class="token punctuation">&gt;</span><span class="token punctuation">&gt;</span></span> <span class="token function">pageMaps</span><span class="token punctuation">(</span><span class="token class-name">IPage</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">T</span><span class="token punctuation">&gt;</span></span> page<span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// 条件分页查询</span>
<span class="token class-name">IPage</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">Map</span><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">,</span> <span class="token class-name">Object</span><span class="token punctuation">&gt;</span><span class="token punctuation">&gt;</span></span> <span class="token function">pageMaps</span><span class="token punctuation">(</span><span class="token class-name">IPage</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">T</span><span class="token punctuation">&gt;</span></span> page<span class="token punctuation">,</span> <span class="token class-name">Wrapper</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">T</span><span class="token punctuation">&gt;</span></span> queryWrapper<span class="token punctuation">)</span><span class="token punctuation">;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<h3 id="8、Count（查记录数）"><a href="#8、Count（查记录数）" class="headerlink" title="8、Count（查记录数）"></a>8、Count（查记录数）</h3><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token comment">// 查询总记录数</span>
<span class="token keyword">int</span> <span class="token function">count</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// 根据 Wrapper 条件，查询总记录数</span>
<span class="token keyword">int</span> <span class="token function">count</span><span class="token punctuation">(</span><span class="token class-name">Wrapper</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">T</span><span class="token punctuation">&gt;</span></span> queryWrapper<span class="token punctuation">)</span><span class="token punctuation">;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span></span></code></pre>
<h3 id="9、Chain（链式）"><a href="#9、Chain（链式）" class="headerlink" title="9、Chain（链式）"></a>9、Chain（链式）</h3><h4 id="query（链式查询）"><a href="#query（链式查询）" class="headerlink" title="query（链式查询）"></a>query（链式查询）</h4><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token comment">// 链式查询 普通</span>
<span class="token class-name">QueryChainWrapper</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">T</span><span class="token punctuation">&gt;</span></span> <span class="token function">query</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// 链式查询 lambda 式。注意：不支持 Kotlin</span>
<span class="token class-name">LambdaQueryChainWrapper</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">T</span><span class="token punctuation">&gt;</span></span> <span class="token function">lambdaQuery</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> 

<span class="token comment">// 示例：</span>
<span class="token function">query</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">eq</span><span class="token punctuation">(</span><span class="token string">"column"</span><span class="token punctuation">,</span> value<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">one</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">lambdaQuery</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">eq</span><span class="token punctuation">(</span><span class="token class-name">Entity</span><span class="token operator">::</span><span class="token function">getId</span><span class="token punctuation">,</span> value<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">list</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<h4 id="update（链式更改）"><a href="#update（链式更改）" class="headerlink" title="update（链式更改）"></a>update（链式更改）</h4><pre class="line-numbers language-java" data-language="java"><code class="language-java"><span class="token comment">// 链式更改 普通</span>
<span class="token class-name">UpdateChainWrapper</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">T</span><span class="token punctuation">&gt;</span></span> <span class="token function">update</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">// 链式更改 lambda 式。注意：不支持 Kotlin </span>
<span class="token class-name">LambdaUpdateChainWrapper</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">T</span><span class="token punctuation">&gt;</span></span> <span class="token function">lambdaUpdate</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token comment">// 示例：</span>
<span class="token function">update</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">eq</span><span class="token punctuation">(</span><span class="token string">"column"</span><span class="token punctuation">,</span> value<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">remove</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token function">lambdaUpdate</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">eq</span><span class="token punctuation">(</span><span class="token class-name">Entity</span><span class="token operator">::</span><span class="token function">getId</span><span class="token punctuation">,</span> value<span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">update</span><span class="token punctuation">(</span>entity<span class="token punctuation">)</span><span class="token punctuation">;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<h2 id="四、参数说明"><a href="#四、参数说明" class="headerlink" title="四、参数说明"></a>四、参数说明</h2><p><strong>下面列举前面出现的参数说明：</strong></p>
<table>
<thead>
<tr>
<th align="center">参数名称</th>
<th align="center">类型</th>
<th align="center">描述</th>
</tr>
</thead>
<tbody><tr>
<td align="center">id</td>
<td align="center">Serializable</td>
<td align="center">主键ID</td>
</tr>
<tr>
<td align="center">entity</td>
<td align="center">T</td>
<td align="center">实体对象</td>
</tr>
<tr>
<td align="center">entityList</td>
<td align="center">Collection<t></t></td>
<td align="center">实体对象集合</td>
</tr>
<tr>
<td align="center">batchSize</td>
<td align="center">int</td>
<td align="center">插入批次数量</td>
</tr>
<tr>
<td align="center">page</td>
<td align="center">IPage<t></t></td>
<td align="center">翻页对象</td>
</tr>
<tr>
<td align="center">wrapper</td>
<td align="center">Wrapper<t></t></td>
<td align="center">实体对象封装操作类</td>
</tr>
<tr>
<td align="center">updateWrapper</td>
<td align="center">Wrapper<t></t></td>
<td align="center">实体对象封装操作类 UpdateWrapper</td>
</tr>
<tr>
<td align="center">queryWrapper</td>
<td align="center">Wrapper<t></t></td>
<td align="center">实体对象封装操作类 QueryWrapper</td>
</tr>
<tr>
<td align="center">mapper</td>
<td align="center">Function&lt;? super Object, V&gt;</td>
<td align="center">转换函数</td>
</tr>
<tr>
<td align="center">idList</td>
<td align="center">Collection&lt;? extends Serializable&gt;</td>
<td align="center">主键ID列表</td>
</tr>
<tr>
<td align="center">columnMap</td>
<td align="center">Map&lt;String, Object&gt;</td>
<td align="center">表字段 map 对象</td>
</tr>
<tr>
<td align="center">throwEx</td>
<td align="center">boolean</td>
<td align="center">有多个 result 是否抛出异常</td>
</tr>
</tbody></table>
<p><strong>官方文档：<a target="_blank" rel="noopener" href="https://mybatis.plus/guide/">https://mybatis.plus/guide/</a></strong></p>

                
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